Methods and apparatus for producing activated carbon from biomass through carbonized ash intermediates
US-12551866-B2 · Feb 17, 2026 · US
Chemical or biological purification of waste gases
Chemical or biological purification of waste gases · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B01D53/34 |
| Official title | Chemical or biological purification of waste gases |
| Display label | Chemical or biological purification of waste gases |
| Total patents | 56 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 9 |
| 2017 | 4 |
| 2018 | 4 |
| 2019 | 9 |
| 2020 | 6 |
| 2021 | 4 |
| 2022 | 6 |
| 2023 | 3 |
| 2024 | 1 |
| 2025 | 3 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Air purifier detecting errors
US-12553631-B2 · Feb 17, 2026 · US
Methods and apparatus for producing activated carbon from biomass through carbonized ash intermediates
US-12350648-B2 · Jul 8, 2025 · US
Methods and apparatus for producing activated carbon from biomass through carbonized ash intermediates
US-2025196101-A1 · Jun 19, 2025 · US
Vacuum system, low-pressure vacuum process device, and cutoff member
US-12191167-B2 · Jan 7, 2025 · US
Separating carbon dioxide and hydrogen from a multicomponent gaseous stream
US-2024350965-A1 · Oct 24, 2024 · US
An air purifier detecting errors
US-2023266027-A1 · Aug 24, 2023 · US
Self-disinfecting antiviral filter material, manufacturing and use thereof, and air filter device with the filter material
US-2023248876-A1 · Aug 10, 2023 · US
Vacuum system, low-pressure vacuum process device, and cutoff member
US-2023008620-A1 · Jan 12, 2023 · US
Alkylation process with thermal oxidation system
US-11492306-B2 · Nov 8, 2022 · US
Method of processing sulfur-bearing wastes from refineries and upgraders
US-11351500-B2 · Jun 7, 2022 · US
Alkylation process with thermal oxidation system
US-2022098129-A1 · Mar 31, 2022 · US
Catalytic converter substrates comprising triply periodic minimal surfaces
US-11286831-B2 · Mar 29, 2022 · US
Methods and apparatus for producing activated carbon from biomass through carbonized ash intermediates
US-2022080389-A1 · Mar 17, 2022 · US
Methods and apparatus for producing activated carbon from biomass through carbonized ash intermediates
US-11213801-B2 · Jan 4, 2022 · US
Systems and methods for remanufacturing selective catalytic reduction systems
US-11148129-B2 · Oct 19, 2021 · US
Hydrocarbon adsorber on high-frequency resonator
US-11118544-B2 · Sep 14, 2021 · US
Systems and methods for remanufacturing selective catalytic reduction systems
US-2021170388-A1 · Jun 10, 2021 · US
SCR catalyst
US-11027265-B2 · Jun 8, 2021 · US
Exhaust unit and image forming apparatus
US-10751707-B2 · Aug 25, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D53/34?
- CPC B01D53/34 is the Cooperative Patent Classification code for “Chemical or biological purification of waste gases.”
- How many patents are filed under CPC B01D53/34 (Chemical or biological purification of waste gases)?
- Our database includes 56 publications tagged with this CPC code.
- Is patent activity under CPC B01D53/34 growing?
- Publication counts under this code: 1 in 2024 vs 3 in 2025 (latest complete years).